Detecção de mudanças na cobertura vegetal a partir do índice de vegetação por diferença normalizada (NDVI) - caso de estudo: provincia de Zambézia

Abstract

In this study, to detect changes in vegetation cover from the Normalized Difference Vegetation Index, MODIS vegetation index products (MOD13Q1) were used, through the Image Difference method. Data from the months of February and December (2000 and 2016) were used for this study. To identify areas of change, the images were reclassified, using Geographic Information Systems programs such as ArcGIS 10.4 ESRI and QGIS 3.22. To identify areas of change, the images were reclassified into four density classes with the following categories: no vegetation, low vegetation, medium vegetation and high vegetation. According to the NDVI density table, areas of change were identified, with changes recorded ranging from 4,997.29 km2 in February to 411.83 km2 in December from no vegetation to high vegetation, 4,996.07 km2 in February to 1,257.50 km2 in December from low vegetation to high vegetation, 28,337.99 km2 in February to 4,388.87 km2 in December from high vegetation to high vegetation. The results of this study allow us to identify future scenarios of vegetation behavior or health, in order to outline measures for the preservation of vegetation cover.